Mineral, Specifically A Detrital Grain

Sandstone

Arenite (specifically sublithic or quartz arenite)

Rose Quartz

Silicon dioxide (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock

Sandstone (specifically an Iron-Concretion)

Arenite with Iron Oxide (Limonite/Goethite) cementation

Weathered vesicular basalt (likely amygdaloidal basalt)

Basalt, composed mainly of plagioclase feldspar, pyroxene, and altered olivine; cavities may contain secondary zeolite, calcite, or silica

Porphyritic Rhyolite

Porphyritic Rhyolite (SiO2)

Sandstone

Arenite (specifically Quartz Arenite)

Magnetite

Magnetite (Fe3O4)

Sandstone

Arenite (specifically Quartz Arenite)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Pink Granite

Granite (Phaneritic Quartz-Feldspar rock)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Agate (specifically Chalcedony/Banded Agate)

Silicon Dioxide (SiO2)

Sandstone Concretion (Omar or Nut Rock)

Sedimentary Concretion (specifically an 'Omarolluk' or Omar)

Moonstone (Green Moonstone / Garnierite)

Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite

Sandstone (Micaceous/Feldspathic variant)

Arenite (specifically subarkose or lithic arenite)

Common Gravel / Pebble

Lithified rock fragment / Detrital sediment

Pink Feldspar with Quartz

Potassium Feldspar (Orthoclase) with SiO2

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Pink Granite

Granite (Phaneritic Acidic Igneous Rock)

Shale

Fissile mudrock (composed of clay-sized particles and detrital grains)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Ferruginous Sandstone

Sandstone with iron oxide (Hematite/Limonite) cement

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Sandstone Pebble

Arenite (specifically Lithic or Quartz Arenite)

Petrified Wood

Silicified Wood (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide staining (Fe2O3)

Granitoid (with Epidote and Orthoclase)

Crystalline Felsic Intrusive Rock (containing SiO2, KAlSi3O8, and Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Fuchsite

K(Al,Cr)2(AlSi3)O10(OH)2

Granite Pebble

Granite (Plutonic Igneous Rock)

Pink Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Greenstone

Greenschist (composed of chlorite, actinolite, and epidote)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)

Green Sandstone

Glauconitic Sandstone

Greenschist

Greenschist (Chlorite-actinolite schist)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Schist (specifically Chlorite/Greenschist)

Chlorite Schist

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Pink Granite

Phaneritic Intrusive Igneous Rock (Granite)

Sandstone

Arenite (specifically Iron-stained Quartz Sandstone)